यदि $0 < x < 1$ है,तो $\sqrt{1 + x^2} [\{x \cos (\cot^{-1} x) + \sin (\cot^{-1} x)\} ^2 - 1]^{\frac{1}{2}} =$ क्या होगा?

  • A
    $\frac{x}{\sqrt{1 + x^2}}$
  • B
    $x$
  • C
    $\sqrt{1 + x^2}$
  • D
    $x \sqrt{1 + x^2}$

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यदि $2 \sin ^{-1} x-3 \cos ^{-1} x=4, x \in[-1,1]$ है,तो $2 \sin ^{-1} x+3 \cos ^{-1} x$ का मान ज्ञात कीजिए।

सिद्ध कीजिए कि $\tan ^{-1}\left(\frac{\sqrt{1+x}-\sqrt{1-x}}{\sqrt{1+x}+\sqrt{1-x}}\right)=\frac{\pi}{4}-\frac{1}{2} \cos ^{-1} x$,जहाँ $-\frac{1}{\sqrt{2}} \leq x \leq 1$.

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${\tan ^{ - 1}}\left[ {\frac{{\sqrt {1 + {x^2}} + \sqrt {1 - {x^2}} }}{{\sqrt {1 + {x^2}} - \sqrt {1 - {x^2}} }}} \right]$,जहाँ $|x| < 1$ और $x \ne 0$ है,का मान क्या होगा?

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